Means for projecting tuning indicia



MEANS FOR PROJECTING TUNING INDICIA Filed Jan. 16, 1937 ?atenied June l, i3?

Application January 16, 1937,

(0l. 11o-12nd) 6 Claims.

My invention relates to radio apparatus and particularly to means for projecting the indicia on a tuning dial onto a screen. This invention represents a variation in the construction described and claimed in my copending application, Serial No. 110,461, filed November 12, 1936.

ln the application above identined I have disclosed a construction in which a tuning dial is employed having concentric series of station designations, the dial being so constructed that light may be projected therethrough. Mounted adjacent to the dial or disc is a source of light adapted to project its rays through said disc, and a lens placed beyond the`dlsc in position to collect the rays passing through the disc and to project the rays onto a screen located in the casing or so arranged as to be visible to the user. This ar rangement, together with means for shifting the disc in order to bring successive ban'ds on the disc into the zone o' operation of the light and lens, provide means for adapting the idea to instru ments operating throughout the range of radio operation.

In the improvement herein disclosed the disc is mounted in a stationary bearing while the lens, or light and lens, are movable radially of the disc. Preferably, the movement is brought about, as in the application above identified-through the medium of the band switch employed instruments of this character.v

The invention will be more readily understood by reference to the accompanying drawing, in which, the igure is a perspective view of apparatus adapted to carry out the invention herein disclosed. A

In a simple form of apparatus I provide a base l0 on which a variable condenserv il is mounted,

the shaft l2 of which is connected by gears i8 to a tuning dial it. Preferably, this dial will be composed of a transparent or.trans1ucent material and have a series of concentric bands i5, i8, Il thereon represented by kilocycles, megocycles or station identications of the various radio sending stations throughout the world. Preferably the indicia is arranged to be readable radially of the disc and will be oi' relatively minute size. In this manner I am able lto provide a large number oi station identifications on a small disc.

As a means for projecting the indicia on screen indicated at il, preferably 'carried by the case o! the instrument, I utilize an electric light is, reflector 20 and di'iiuser 2i all mounted` on a slide 22 carried on guides 28 supported by a bracket 24. A lens indicated at 2B is,carried on'a single point on the screen regardless oi' the l Li.

no nasser on a support te guided on a bracket it. Movement o the respective light projecting elements,

in order to cause the light rays to be projected through dierent bands on the disc, is brought about through a chain t@ connected to the slide it and a chain 2@ connected to the slide it, the

respective chains engng sprockets it, 3i

mounted on a shaft di that operates a band` switch t3.

In order to maintain the proper focus on the screen, which will be stationary and to maintain the focus at the same point on the screen regardless oi movement of the light and lens, it is necessary that the movement of the light source and the lens be slightly dierent and thus the sprocket t@ for moving the light and associated parts is oi greater diameter than the sprocket 3l Vior moving the lens. will bring about greater movement ci the light than of the lens, and insure that the indicia will always be projected onto the same point on the screen regardless oi movement oi the light and lens. i z: enables the use ci a screen no wider than the projected matter in any position.

It will be noted that I have shown the indicia on the disc as arranged radially and the iight projection apparatus located at a point corresponding to a horizontal line through the axis of rotation oi' the disc. The advantage trom a practical-standpoint of an arrangement such as this is in that spacemay be conserved and a much smaller disc may be used than would be possible by any other arrangement; this for the reason that the angular space required on the disc for any station identication is no greater than the height of the letters or gures used for said identiilcatlon. 1f the indicia. were arranged to be readable circumierentially oi the disc, the space required would be many times greater and require a disc oi' unwieldy I claim:

1. The combination in a multi-band radio set.' of a light source, focusing lens, projection screen, and a transparent rotatable station designating dial suitably mounted in said radio, the periphery oi which isA disposed between the light and lens,y said dial having avplurality oi' wave band .indicia radially spaced'i'roxn the periphery thereoi. means for moving said light source and lens across desired wave bands on said dial whereby to project dlerent radially spaced indicia upon thescreen. and means associated with said movingmeans for maintaining a focus o! the. lens movement of lens.

2. In a multi-band radio set, the combination of a reflector, a light source, a focusing lens and a screen mountedpin operable alignment, a rotatable, transparent, station selecting dial operably mounted on said radio and having indicia thereon corresponding to radio stations, said indicia being disposed in a plurality of radially spaced sections, depending upon the wave bands to which they correspond, the outer portion of said dial being disposed' between-thedi'ght-*and the-lens,

means 4operable on said radio for moving said reflector light source and lens across desired wave band indicia on said dial, whereby to project different radially spaced indicia uponthescreen, and means associated with' said moving means for maintaining a focus of the lens on asingle point on the screen regardless' of the movement of the lens.

3. In a radio receiving set, the combination with a tuning device having a shaft, of a subfstantially transparent station selecting disc connected to said shaft for rotation therewith, said disc providing a plurality of circularly arranged,

radially spaced indicia, a source of light placed to project rays through said disc past said indicia, a lens positioned to focus said rays,a screen on which said rays are projected to reproduce the indicia on said dis'c exposed to said light source, means for shifting said light source and lens to project different radially spaced indicia, and means associated with said shifting means for maintaining a focus of the lens on substantially a single point on the screen regardless of thev movement of the light and lens. v

4. In a multi-band radio receiving set, the combination with a tuning device having a shaft, of a light permeable station selecting disc connected to said shaft for rotation therewith, said disc providing a plurality of circularly arranged radially spaced wave-band indicia,a light source placed to project rays throughL said indicia on said 'disc, a lens positioned to focus said rays, a screen on which said rays are projected to reproduce the exposed indicia; means for shifting said lens and light source to project different radially 'spaced wave-band indicia, and means associated with said shifting means for maintaining a sub1 stantially constant focus of the lens regardless of the movement thereof.

5. 'I'he combination in a multi-band radio set, of a light source, focusing lens,v projecting screen, and a transparent rotatable station designating dial suitably mounted in said radio, the periphery of which is disposed between the light and lens, said dial having a plurality of wave band indicia radially readable and radially spaced from the periphery thereof, means for moving said light source and lens across desired wave bands on said dial whereby to project different radially spaced indicia upon the screen, and means associated with said moving means for maintaining a focus of the lens on a single point on the screen regardless of 'the movement of the lens.

6. In a radio receiving set, the 'combination with a tuning device having a'shaft, of a substantially transparent station selecting disc connected to said shaft for rotation therewith, said disc providing'a plurality of circularly arranged,

vradially spacedindicia, a source of light placed to project rays through said disc past said indicia, a lens ositioned to focus said rays, a screen on which sa d rays are projected to reproduce the indicia on said disc exposed to said light source, means for shifting said lens to project dierent radially spaced indlcia,'and meansassociated with said light, lens and disc for effecting a focus of the projected matter at asingle point on the screen regardless of movement of any one or more thereof.

JOI-IN L. MCWEENY. 

